DE9010910U1 - Tubular filter - Google Patents

Description

18 671 B/go

company

Electrostar Shaker

GmbH ■:·. Co.

Stuttgarter Strasse 36
7313 Reichenbach / FiIs

Rohrartiner Filter

The invention relates to a tube-like filter, in particular for a vacuum cleaner, whose casing consists of folds arranged in a row. For the sake of simplicity, we will only refer to a vacuum cleaner filter below, because this is the preferred field of application, but this must not be
be interpreted restrictively. If such a FlLt^r, for example at one of its two ends by means of a plate
or a similar element, so that a total of

a pot-shaped structure is created, it is still considered a robr-type filter because the medium flows through the pipe wall in the preferred way, normally from the outside inwards. Such filters can be used for both dry vacuum cleaners and wet-dry vacuum cleaners. As a result, they must not only let the sucked-in air through, but also the water if necessary. If such a filter is flowed through from the outside inwards, which, as mentioned, is the usual case, the solid suction material is deposited on the outside of the filter.

The well-known tubular filter has V-shaped folds in its cross-section and as a result it also has V-shaped spaces between the folds If you look at the radial flow direction, these spaces between the folds narrow from the outside to the inside and this means that they become blocked relatively easily. Sometimes only bridges are formed. These fall downwards at least when the filter is subjected to vibration. Such vibrations occur when the vacuum cleaner is transported or when the filter is shaken using a device specially designed for this purpose.

Because the spaces between the folds are closed, they become increasingly clogged , at least after shaking from bottom to top, and the permeability for air and, in some cases, liquid decreases more and more. As a result, the filter must be removed more often and replaced by another one or

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The ^first task of the inventor is to further develop the filter of the type described at the beginning in such a way that it has a longer filter life, ie, when the filter is switched on, no more filters are added, such as the well-known ones.

To achieve this goal, it is expected that the ^filter element will be designed in accordance with the characteristic part of this claim. Because the intermediate spaces in the filter element ^now widen towards ^the bottom, this filter element can certainly form bridges, especially in the upper part. However, these bridges fall ^easily downwards if the bridges are heavy enough or if the filter is shaken or even jolted. There it can... but not immediately to bridge formation again, because this is not possible due to the expanded cross-section in the lower area. The manufacture of such a filter is not necessarily more complicated or expensive, in fact the opposite can be the case. Of course, ^the same filter material can be used that has already been used with advantage in a comparable filter of the state of the art. It is also expedient in this respect to be a removable and thus replaceable or cleanable

capable FiIt-Pr.

T-: A further development of the invention provides that the folds 7, ⁸ and the interspaces are expanded from top to bottom. The shape of the interspace is particularly advantageous for manufacturing and operational reasons. Viewed in the radial direction, the depth of the interspaces can be constant over the entire height of the filter and, in the preferred case, it is never constant.

A further embodiment of the invention is that the spaces between the folds narrow towards the top to approximately zero. In other words, the folds lie directly against each other at the top.

Another embodiment of the invention is characterized by a filter material of constant thickness, with the fold interiors narrowing downwards to approximately zero. This means that the fold interiors narrow from top to bottom to the extent that the fold interspaces widen. In terms of shape, the fold interiors can have the same cross-section as the fold interspaces. The fold interiors and fold interspaces have an identical cross-section at approximately half the height of the filter if the filter is cylindrical, the outer fold ends of which lie on an imaginary cylinder enveloping the filter and in

- 8 (The inner folds are adjacent to an imaginary inner cylinder. The filter does not necessarily have to be cylindrical, rather it should be conical, blunt-pointed, with a conical shape on the outside. If it is a filter for a wet-dry vacuum cleaner, the cylindrical shape with a constant inner cross-section over the height is preferred. The advantage is that a float switch is required for wet vacuum cleaners and the interior of the filter can accommodate this float. The space for the float should neither expand nor contract from the top, so that it functions properly. ion of the float switch-off device is ensured.

A further development of the invention is characterized in that the spaces between the folds and the inner spaces between the folds have approximately the same shape, but are arranged turned by 180 degrees. As a result, viewed over the height, the inner space between the folds and the space between the folds together always have the same cross-sectional area. The 180-degree angle is very advantageous with regard to the starting material for cutting, but is not absolutely necessary.

A further variant of the invention is characterized in that the folds have an approximately V-shaped space at their lower end and an approximately U-shaped space at their upper end. With regard to the interior of the folds, the transverse

sections over the height are just the opposite. Dlp V-shape is, strictly speaking, a U-shape with a very short ¹ J ■ Cross: schenk"! .

A further aspect of the invention is that the sealing elements on ^the upper and lower filters are arranged directly next to one another. In this way, there is a closed upper outer contour and a closed inner contour, which considerably simplifies the sealing and also the manufacture of this entire filter. In particular , The advantage is that the formation of a clear lower filter for the filter does not necessarily ^require the lower ends of the gaps to be closed, so that if there is enough space underneath the filter, the dirt in the gaps between the folds can escape downwards from the gaps between the folds when shaken, ^etc. , and can end up in a dirt collection container, for example. This increases the service life of the filter considerably. The fold walls that are directly adjacent to one another at the lower end of the filter and the fold walls of adjacent folds that are adjacent to one another at the upper end of the filter are tightly connected to one another to prevent undesirable flow paths.

In this context, a further development of the invention is proposed, which consists in the spaces between the folds at the lower end of the filter being tightly fitted to a collar of a lower filter closure element. This collar is located inside the

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Filter and therefore the inner surface of the lower end of the fold spaces is glued to the outside of the collar or tightly fastened in another known and suitable way. Compared to the state of the art, this also leads to a comparatively smaller filter closure element. Otherwise, the latter can be designed in the same way as the previously known one. The filter spaces here are directly adjacent to one another, which is why the lower fold walls also lie directly against one another. In this way, an exchange of dirt via the lower fold ends when they protrude in a radial direction over the collar of the filter closure element is prevented. Because these filter spaces or their U-shaped cross legs can be glued directly to the collar of a lower filter closure element, the relatively expensive embedding of the entire lower filter cross section in a sealing material, for example polyurethane, inside a pot-shaped filter closure element that accommodates the lower filter end is no longer necessary. The same also applies to the upper end of the filter.

In this respect, a preferred embodiment of the invention provides that the U-shaped cross legs of the upper fold ends are tightly connected to an upper filter ring, in particular to the inner surface of a filter ring outer band. Here too, the U-shaped cross legs of the upper filter ends preferably lie directly against one another. The filter ring can also be an elastic band. In practice, the U-shaped cross legs of the upper filter ends can be tightly connected to one another ^.

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a known supporting fabric, which can be designed in the same way as in the state of the art,

The invention is explained in more detail below with reference to the drawing, the drawing shows an ^exemplary embodiment of the invention. These show:

Fig. 1 A. Side view of the filter,

Fig. 2 a view of the filter from below,

Fig. 3 a view of the filter from above,

Fig. 4 a section of the development of the filter material.

The tubular filter is provided with folds 1 arranged evenly around the circumference, the outer contours of which lie on a common imaginary circular cylinder and the inner ends of which are located on a common, concentric imaginary inner cylinder. However, according to Figs. 1 and 3, these folds have a very special cross-sectional shape, which means that the fold spaces 2 between adjacent folds 1 widen from top to bottom in the position of use. At their lower end - Fig. shows the position of use of the filter - the fold space is approximately U-shaped (Fig. 2). Towards the top, the fold spaces narrow more and more until finally the value reaches zero.

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is. The adjacent fold walls of two folds are then in direct contact with one another. Conversely, the folds have a very pointed cross-section at their lower end, which is caused by the fact that the two walls of each fold are in direct contact with one another. Accordingly , the folds and the spaces between the folds each have the same shape, but the spaces between the folds are each turned by 180 degrees. In addition to the above, the cross-legs ^J of the U-shaped spaces between the folds abut directly against one another, so that, if one disregards the material thickness of the fold walls, the cross-legs of the spaces between the folds almost directly overlap one another at the lowest end. The small distances between the adjacent cross-legs 3 are bridged by the inner ends of the fold walls, so that a circumferential line or, in practice, a circumferential area is created at the lower end, which can be tightly glued to a downwardly projecting collar 4 of a filter closure element 5. The filter closure element has a pot-shaped shape with the bottom facing downwards when in use. protruding pot rim, which forms the mentioned collar 4.

Due to the identity of the fold cross-section and the fold interspace cross-section at the upper and lower filter ends, the conditions at the upper filter end are comparable in that a circumferential line or <>circumferential area is also created there, but this is located on the outside as shown in Fig. 1 of the drawing. It is overlapped by an upper filter ring 6, whereby

Absolute tightness is ensured at this point too. The upper filter ring 6 can be designed in a known manner and made of "elastic" material. In the embodiment example according to Fig. 3 ^, it is equipped with a known concentric groove 7. Merely to avoid misunderstandings, it is pointed out that the folds in Fig. 2 are offset by half a unit in the circumferential direction compared to those in Fig. 1. In addition, it is expressly noted again that this filter abuts an imaginary circular cylinder on the outside and inside, but the shape can also be different, for example conically tapering or widening.

Fig. 4 shows a section of the development for the filter with the grooves 8, 9 and 10, 11. The grooves 8, 9 enclose an equilateral acute triangle, which gives the outer contour of a fold 1. In contrast, the groove lines 10 and 9 form a triangle of the same shape, which after folding forms the inner end * of a fold gap 2. The surfaces 12 and 13 delimited by parallel lines give the side edges of a fold 1, while the adjacent surfaces 13 and 14 are lateral boundaries of a fold gap 2.3.

As can be seen particularly well in Fig. 1, the adjacent, 'rectangular' shaped, outer front surfaces of the folds 1 create an interrupted circumferential mantle line, which

The air flow through the suction air is good in the circumferential direction. The air flow decreases, however, from top to bottom. The air flow prevents the accumulation of dirt and in this way a build-up of dirt is created which, as mentioned, is at the top of the mark. In the case of the fire, this can be seen in the fog . ] (lung and adhesion of dirt is ensured by the fact that these spaces continually expand from top to bottom. If dirt does nevertheless collect in the fold spaces 7. , this can be shaken off the walls of the fold spaces and it can therefore push the filter slightly downwards because the fold spaces 2 , in contrast to the original filter, are open at the bottom. This is due to... 1 (!(here that the outer circumference or the collar 4 of the filter closure element 'j is smaller than the outer circumference of the filter or, in other words, because this collar 4 only reaches to the inner ends of the folds 1 or the bottom of the spaces between the folds ?.

From the above it follows that this filter has advantages in terms of manufacturing technology and is less likely to become clogged than a previous filter, so that if dirt accumulates in the spaces between the folds, it can be shaken out downwards so that the filter is easily accessible again without having to be removed and cleaned. Inside the filter there is a known grid-like support fabric 15, which

the funding increases and the fuel consumption is not significantly reduced. The order also adds that the U j

! r.'iiPiikcl of the inner folds according to Fig. I and 3 with 16

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and one can see there asn.l the fold interiors 17, which narrow from ^Y f above nail) and ! ir. pt wri to the value zero.

Claims (10)

18 67 1 B/go A_n __s &rgr; rue h e 1. Pipe type filter, especially for a S whose casing consists of folds (1) arranged in ^a row ^, characterized in that the spaces between the folds (2) are widened towards the lower end of the fillet when in use. 2. Filter according to claim 1, characterized in that the ^gaps (2) are continuously expanded from top to bottom. 3. Filter according to claim 1 or 2, characterized in that the spaces between the folds (2) narrow upwards hm to approximately the value zero. 4. Folder according to claim 3, characterized by filter material of constant thickness, wherein the fold interiors (17) narrow downwards to approximately zero. 5. Filter according to at least one of the preceding claims. characterized in that the spaces between the folds (2) and the pleat interiors (17) have approximately the same shape, but are arranged turned by 180 degrees. 6. Filter according to at least one of the preceding claims, characterized in that the folds (1) have an approximately V-shaped fold at their lower end and an approximately r have a U-shaped cross-section. 7. Filter according to claim 6, characterized in that the U-shaped transverse legs (16) of adjacent folds (1) at the upper end of the filter and of adjacent fold interspaces (2) at the lower end of the filter connect directly to one another. 8. Filter according to claim 7, characterized in that the gaps between the folds (2) at the lower end of the filter are tightly connected to a collar (4) of a lower filter closure element (S). 9. Filter according to claim 7 or 8, characterized in that the outer legs (16) of the upper fold ends lie tightly against an upper filter ring (6), in particular the inner surface of a filter ring outer ring. 10. Filter according to claim 9, characterized in that the oil filter ring (fc) is at the same time an elastic sealing ring. ■· · a· ·■ ■« · &igr; &bull; « « · · j Ii ■ &igr; : &igr;&igr; Ii . it ■ t lsi ; &igr; * fit· It-I · · «a ti l* - 3 -11. Filter according to at least one of the preceding claims, characterized in that there is a supporting fabric (15) in the interior of the filter.